>>2033038My my my, have I got the exact right thing for you:
https://www.youtube.com/watch?v=mm1m4B42vqwWhat you have is apparently a "proprietary" shifter boss
The search term is "proprietary type shifter boss"
You can modify normal cable stops to fit or buy something for 20-35$
This dude shows the modification process, you basically just file a wide enough notch on the corresponding edge of the left and right cable stop
https://simplicityvintagecycles.com/2012/04/09/the-kodiak-saga-continues/